A link to a tool that calculates the day which was manufactured your SX-70 or SLR 680 camera
The serial number is here:
I have this for my SX-70:
The complete serial number you entered is 5K021529558.
Your camera has the Alpha 1 shutter design with the Alpha "K" focus wheel.
Your camera is probably an SX-70 model 2 or Alpha 2.
The serial number itself is: 15295
Your camera was made on October 20, 1980 during the A shift.